I have a few dozen neon teras in a 55G community tank. Heavily planted, med tech, DIY CO2 dosing, weekly 50% water changes. Bioload is 9 asian glass catfish, a pair of bolivian rams, 9 black neon tetras, 10 khuli loaches, 5 german blue rams. The fish started to have this white lesions that starts in the middle of the body, removes the red color but leaves the blue line intact and after 4-5 days they die. I haven't seen any fish attack them. The tank is fed twice. They are small, around under an inch.
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